[dpdk-dev] [PATCH 2/2] igb: fix VF statistic wraparound handling macro

[Roger B. Melton]

ack

On 10/12/15 9:33 AM, Harry van Haaren wrote:
> Fix a misinterpreatation of VF statistic macro in e1000/igb.
>
> Signed-off-by: Harry van Haaren <harry.van.haaren at intel.com>
> ---
>   drivers/net/e1000/igb_ethdev.c | 6 +++++-
>   1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/e1000/igb_ethdev.c b/drivers/net/e1000/igb_ethdev.c
> index 848ef6e..e3f7402 100644
> --- a/drivers/net/e1000/igb_ethdev.c
> +++ b/drivers/net/e1000/igb_ethdev.c
> @@ -246,7 +246,11 @@ static void eth_igb_configure_msix_intr(struct rte_eth_dev *dev);
>   #define UPDATE_VF_STAT(reg, last, cur)            \
>   {                                                 \
>   	u32 latest = E1000_READ_REG(hw, reg);     \
> -	cur += latest - last;                     \
> +	if(likely(latest > last)) {               \
> +		cur += latest - last;             \
> +	} else {                                  \
> +		cur += (UINT_MAX - last) + latest;\
> +	}                                         \
>   	last = latest;                            \
>   }
>   

-- 
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